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Bruce Fields" Cc: linux-nfs@vger.kernel.org, Al Viro , David Howells , Joshua Watt Subject: [RFC v4 6/9] NFS: Add debugfs for nfs_server and nfs_client Date: Fri, 17 Nov 2017 11:45:49 -0600 Message-Id: <20171117174552.18722-7-JPEWhacker@gmail.com> X-Mailer: git-send-email 2.13.6 In-Reply-To: <20171117174552.18722-1-JPEWhacker@gmail.com> References: <20171117174552.18722-1-JPEWhacker@gmail.com> Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Signed-off-by: Joshua Watt --- fs/nfs/Makefile | 2 +- fs/nfs/client.c | 87 ++++++++++++++++++++++++++-- fs/nfs/debugfs.c | 143 ++++++++++++++++++++++++++++++++++++++++++++++ fs/nfs/inode.c | 5 ++ fs/nfs/internal.h | 10 ++++ fs/nfs/nfs4client.c | 1 + include/linux/nfs_fs_sb.h | 5 ++ 7 files changed, 247 insertions(+), 6 deletions(-) create mode 100644 fs/nfs/debugfs.c diff --git a/fs/nfs/Makefile b/fs/nfs/Makefile index c587e3c4c6a6..9a0553888a28 100644 --- a/fs/nfs/Makefile +++ b/fs/nfs/Makefile @@ -6,7 +6,7 @@ obj-$(CONFIG_NFS_FS) += nfs.o CFLAGS_nfstrace.o += -I$(src) -nfs-y := client.o dir.o file.o getroot.o inode.o super.o \ +nfs-y := client.o debugfs.o dir.o file.o getroot.o inode.o super.o \ io.o direct.o pagelist.o read.o symlink.o unlink.o \ write.o namespace.o mount_clnt.o nfstrace.o export.o nfs-$(CONFIG_ROOT_NFS) += nfsroot.o diff --git a/fs/nfs/client.c b/fs/nfs/client.c index 22880ef6d8dd..7bab47d0dd07 100644 --- a/fs/nfs/client.c +++ b/fs/nfs/client.c @@ -142,6 +142,32 @@ void unregister_nfs_version(struct nfs_subversion *nfs) } EXPORT_SYMBOL_GPL(unregister_nfs_version); +static DEFINE_IDA(nfs_client_ids); + +void +nfs_cleanup_client_ids(void) +{ + ida_destroy(&nfs_client_ids); +} + +static int +nfs_alloc_client_id(struct nfs_client *client) +{ + int id; + + id = ida_simple_get(&nfs_client_ids, 0, 0, GFP_KERNEL); + if (id < 0) + return id; + client->cl_id = id; + return 0; +} + +static void +nfs_free_client_id(struct nfs_client *client) +{ + ida_simple_remove(&nfs_client_ids, client->cl_id); +} + /* * Allocate a shared client record * @@ -161,6 +187,8 @@ struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) if (!try_module_get(clp->cl_nfs_mod->owner)) goto error_dealloc; + nfs_alloc_client_id(clp); + clp->rpc_ops = clp->cl_nfs_mod->rpc_ops; atomic_set(&clp->cl_count, 1); @@ -249,8 +277,11 @@ void nfs_free_client(struct nfs_client *clp) if (clp->cl_machine_cred != NULL) put_rpccred(clp->cl_machine_cred); + nfs_client_debugfs_unregister(clp); + put_net(clp->cl_net); put_nfs_version(clp->cl_nfs_mod); + nfs_free_client_id(clp); kfree(clp->cl_hostname); kfree(clp->cl_acceptor); kfree(clp); @@ -380,6 +411,17 @@ nfs_found_client(const struct nfs_client_initdata *cl_init, return clp; } +static struct nfs_client * +init_client(struct nfs_client *new, const struct nfs_client_initdata *cl_init) +{ + struct nfs_client *ret = + cl_init->nfs_mod->rpc_ops->init_client(new, cl_init); + + if (ret) + nfs_client_debugfs_register(new); + return ret; +} + /* * Look up a client by IP address and protocol version * - creates a new record if one doesn't yet exist @@ -411,7 +453,7 @@ struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) &nn->nfs_client_list); spin_unlock(&nn->nfs_client_lock); new->cl_flags = cl_init->init_flags; - return rpc_ops->init_client(new, cl_init); + return init_client(new, cl_init); } spin_unlock(&nn->nfs_client_lock); @@ -856,6 +898,32 @@ void nfs_server_remove_lists(struct nfs_server *server) } EXPORT_SYMBOL_GPL(nfs_server_remove_lists); +static DEFINE_IDA(nfs_server_ids); + +void +nfs_cleanup_server_ids(void) +{ + ida_destroy(&nfs_server_ids); +} + +static int +nfs_alloc_server_id(struct nfs_server *server) +{ + int id; + + id = ida_simple_get(&nfs_server_ids, 0, 0, GFP_KERNEL); + if (id < 0) + return id; + server->id = id; + return 0; +} + +static void +nfs_free_server_id(struct nfs_server *server) +{ + ida_simple_remove(&nfs_server_ids, server->id); +} + /* * Allocate and initialise a server record */ @@ -867,6 +935,8 @@ struct nfs_server *nfs_alloc_server(void) if (!server) return NULL; + nfs_alloc_server_id(server); + server->client = server->client_acl = ERR_PTR(-EINVAL); /* Zero out the NFS state stuff */ @@ -879,10 +949,8 @@ struct nfs_server *nfs_alloc_server(void) atomic_set(&server->active, 0); server->io_stats = nfs_alloc_iostats(); - if (!server->io_stats) { - kfree(server); - return NULL; - } + if (!server->io_stats) + goto out_error; ida_init(&server->openowner_id); ida_init(&server->lockowner_id); @@ -890,6 +958,10 @@ struct nfs_server *nfs_alloc_server(void) rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC"); return server; +out_error: + nfs_free_server_id(server); + kfree(server); + return NULL; } EXPORT_SYMBOL_GPL(nfs_alloc_server); @@ -910,9 +982,12 @@ void nfs_free_server(struct nfs_server *server) nfs_put_client(server->nfs_client); + nfs_server_debugfs_unregister(server); + ida_destroy(&server->lockowner_id); ida_destroy(&server->openowner_id); nfs_free_iostats(server->io_stats); + nfs_free_server_id(server); kfree(server); nfs_release_automount_timer(); } @@ -973,6 +1048,7 @@ struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info, nfs_server_insert_lists(server); server->mount_time = jiffies; nfs_free_fattr(fattr); + nfs_server_debugfs_register(server); return server; error: @@ -1033,6 +1109,7 @@ struct nfs_server *nfs_clone_server(struct nfs_server *source, server->mount_time = jiffies; nfs_free_fattr(fattr_fsinfo); + nfs_server_debugfs_register(server); return server; out_free_server: diff --git a/fs/nfs/debugfs.c b/fs/nfs/debugfs.c new file mode 100644 index 000000000000..0195431427c2 --- /dev/null +++ b/fs/nfs/debugfs.c @@ -0,0 +1,143 @@ +// SPDX-License-Identifier: GPL-2.0 +/** + * debugfs interface for nfs + * + * (c) 2017 Garmin International + */ + +#include +#include +#include + +#include "nfs4_fs.h" +#include "internal.h" + +static struct dentry *topdir; +static struct dentry *nfs_server_dir; +static struct dentry *nfs_client_dir; + +static struct dentry* +link_rpc_client(char const *name, struct rpc_clnt *client, + struct dentry *parent) +{ + int len; + char target[34]; /* "../../../sunrpc/rpc_clnt/" + 8 hex digits + '\0' */ + + if (IS_ERR(client) || !client->cl_debugfs) + return NULL; + + len = snprintf(target, sizeof(target), "../../../sunrpc/rpc_clnt/%s", + client->cl_debugfs->d_name.name); + + if (len >= sizeof(target)) + return NULL; + + return debugfs_create_symlink(name, parent, target); +} + +void +nfs_server_debugfs_register(struct nfs_server *server) +{ + char name[26]; /* "../../nfs_client/" + 8 hex digits + '\0' */ + int len; + + if (server->debugfs || !nfs_server_dir) + return; + + len = snprintf(name, sizeof(name), "%x", server->id); + if (len >= sizeof(name)) + return; + + server->debugfs = debugfs_create_dir(name, nfs_server_dir); + if (!server->debugfs) + return; + + link_rpc_client("rpc_client", server->client, server->debugfs); + link_rpc_client("rpc_client_acl", server->client_acl, server->debugfs); + + if (server->nfs_client->cl_debugfs) { + len = snprintf(name, sizeof(name), "../../nfs_client/%s", + server->nfs_client->cl_debugfs->d_name.name); + if (len >= sizeof(name)) + goto out_error; + + if (!debugfs_create_symlink("nfs_client", server->debugfs, + name)) + goto out_error; + } + + return; +out_error: + debugfs_remove_recursive(server->debugfs); + server->debugfs = NULL; +} +EXPORT_SYMBOL_GPL(nfs_server_debugfs_register); + +void +nfs_server_debugfs_unregister(struct nfs_server *server) +{ + debugfs_remove_recursive(server->debugfs); + server->debugfs = NULL; +} + +void +nfs_client_debugfs_register(struct nfs_client *client) +{ + char name[9]; /* 8 hex digits + '\0' */ + int len; + + if (client->cl_debugfs || !nfs_client_dir) + return; + + len = snprintf(name, sizeof(name), "%x", client->cl_id); + if (len >= sizeof(name)) + return; + + client->cl_debugfs = debugfs_create_dir(name, nfs_client_dir); + if (!client->cl_debugfs) + return; + + link_rpc_client("rpc_client", client->cl_rpcclient, + client->cl_debugfs); +} + +void +nfs_client_debugfs_unregister(struct nfs_client *client) +{ + debugfs_remove_recursive(client->cl_debugfs); + client->cl_debugfs = NULL; +} + +void __exit +nfs_debugfs_exit(void) +{ + debugfs_remove_recursive(topdir); + topdir = NULL; + nfs_client_dir = NULL; + nfs_server_dir = NULL; +} + +void __init +nfs_debugfs_init(void) +{ + topdir = debugfs_create_dir("nfs", NULL); + if (!topdir) + return; + + nfs_server_dir = debugfs_create_dir("nfs_server", topdir); + if (!nfs_server_dir) + goto out_remove; + + nfs_client_dir = debugfs_create_dir("nfs_client", topdir); + if (!nfs_client_dir) + goto out_remove; + + return; +out_remove: + debugfs_remove_recursive(topdir); + topdir = NULL; + nfs_server_dir = NULL; + nfs_client_dir = NULL; +} + + diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c index 134d9f560240..28879236f949 100644 --- a/fs/nfs/inode.c +++ b/fs/nfs/inode.c @@ -2144,6 +2144,8 @@ static int __init init_nfs_fs(void) if (err) goto out0; + nfs_debugfs_init(); + return 0; out0: rpc_proc_unregister(&init_net, "nfs"); @@ -2181,6 +2183,9 @@ static void __exit exit_nfs_fs(void) unregister_nfs_fs(); nfs_fs_proc_exit(); nfsiod_stop(); + nfs_cleanup_server_ids(); + nfs_cleanup_client_ids(); + nfs_debugfs_exit(); } /* Not quite true; I just maintain it */ diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index 3ec165368a08..969958205cbd 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -156,6 +156,7 @@ extern void nfs_umount(const struct nfs_mount_request *info); /* client.c */ extern const struct rpc_program nfs_program; extern void nfs_clients_init(struct net *net); +void nfs_cleanup_client_ids(void); extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t); struct nfs_client *nfs_get_client(const struct nfs_client_initdata *); @@ -165,6 +166,7 @@ void nfs_server_remove_lists(struct nfs_server *); void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans); int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t, rpc_authflavor_t); +void nfs_cleanup_server_ids(void); struct nfs_server *nfs_alloc_server(void); void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *); @@ -561,6 +563,14 @@ void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, struct nfs_direct_req *dreq); extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq); +/* debugfs.c */ +void nfs_server_debugfs_register(struct nfs_server *server); +void nfs_server_debugfs_unregister(struct nfs_server *server); +void nfs_client_debugfs_register(struct nfs_client *client); +void nfs_client_debugfs_unregister(struct nfs_client *client); +void __exit nfs_debugfs_exit(void); +void __init nfs_debugfs_init(void); + /* nfs4proc.c */ extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, const struct nfs_client_initdata *); diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c index e9bea90dc017..ef725106e45c 100644 --- a/fs/nfs/nfs4client.c +++ b/fs/nfs/nfs4client.c @@ -1086,6 +1086,7 @@ struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info, if (error < 0) goto error; + nfs_server_debugfs_register(server); return server; error: diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h index 286b71c418b4..5dac856355f0 100644 --- a/include/linux/nfs_fs_sb.h +++ b/include/linux/nfs_fs_sb.h @@ -27,6 +27,7 @@ struct nfs41_impl_id; struct nfs_client { atomic_t cl_count; atomic_t cl_mds_count; + unsigned int cl_id; /* client id */ int cl_cons_state; /* current construction state (-ve: init error) */ #define NFS_CS_READY 0 /* ready to be used */ #define NFS_CS_INITING 1 /* busy initialising */ @@ -120,6 +121,7 @@ struct nfs_client { #endif struct net *cl_net; + struct dentry *cl_debugfs; /* debugfs entry */ }; /* @@ -131,6 +133,7 @@ struct nfs_server { * that share the same client */ struct list_head master_link; /* link in master servers list */ + unsigned int id; /* server id */ struct rpc_clnt * client; /* RPC client handle */ struct rpc_clnt * client_acl; /* ACL RPC client handle */ struct nlm_host *nlm_host; /* NLM client handle */ @@ -225,6 +228,8 @@ struct nfs_server { unsigned short mountd_port; unsigned short mountd_protocol; struct rpc_wait_queue uoc_rpcwaitq; + + struct dentry *debugfs; }; /* Server capabilities */